The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 25, 1983
Filed:
Jun. 11, 1982
Dowa Mining Co., Ltd., Tokyo, JP;
Abstract
There is disclosed a novel dry process for the production of hexagonal-system ferrite having the formula: MO.multidot.nFe.sub.2 O.sub.3, wherein n represents a real number of 5.1-5.8 and M represents at least one metallic element selected from the group consisting of Ba, Sr and Pb. The ferrite is baked in the presence of the mixed additive comprising X-agent selected from the group consisting of KCl, NaCl and LiCl; and Y-agent selected from the group consisting of KBO.sub.2, NaBO.sub.2 and LiBO.sub.2 and/or the group consisting of K.sub.2 CO.sub.3, Na.sub.2 CO.sub.3 and Li.sub.2 CO.sub.3. After baking, the mixed additive is completely removed from the resulting ferrite by washing or by a wet-process disintegrating treatment. By changing the mixing ratio of said X-agent to said Y-agent, ferrite crystals having various characteristic properties can be obtained.